linux-kernel - [PATCH 3/3] usb: dwc2: drd: reset current session before setting the new one

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Message-ID: <20211005095305.66397-4-amelie.delaunay@foss.st.com>
Date:   Tue, 5 Oct 2021 11:53:05 +0200
From:   Amelie Delaunay <amelie.delaunay@...s.st.com>
To:     Minas Harutyunyan <hminas@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>
Subject: [PATCH 3/3] usb: dwc2: drd: reset current session before setting the new one

If role is changed without the "none" step, A- and B- valid session could
be set at the same time. It is an issue.
This patch resets A-session if role switch sets B-session, and resets
B-session if role switch sets A-session.
Then, it is possible to change the role without the "none" step.

Fixes: 17f934024e84 ("usb: dwc2: override PHY input signals with usb role switch support")
Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
---
 drivers/usb/dwc2/drd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc2/drd.c b/drivers/usb/dwc2/drd.c
index 99672360f34b..aa6eb76f64dd 100644
--- a/drivers/usb/dwc2/drd.c
+++ b/drivers/usb/dwc2/drd.c
@@ -40,6 +40,7 @@ static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid)
 	    (!valid && !(gotgctl & GOTGCTL_ASESVLD)))
 		return -EALREADY;
 
+	gotgctl &= ~GOTGCTL_BVALOVAL;
 	if (valid)
 		gotgctl |= GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL;
 	else
@@ -58,6 +59,7 @@ static int dwc2_ovr_bvalid(struct dwc2_hsotg *hsotg, bool valid)
 	    (!valid && !(gotgctl & GOTGCTL_BSESVLD)))
 		return -EALREADY;
 
+	gotgctl &= ~GOTGCTL_AVALOVAL;
 	if (valid)
 		gotgctl |= GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL;
 	else
-- 
2.25.1